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<a name="boost.process.v2.environment.value_view"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct value_view</span></h2>
<p>boost::process::v2::environment::value_view — A view for a value in an environment. </p>
</div>
<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../../boost_process/v2.html#header.boost.process.v2.environment_hpp" title="Header &lt;boost/process/v2/environment.hpp&gt;">boost/process/v2/environment.hpp</a>&gt;

</span>
<span class="keyword">struct</span> <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">char_type</span>                                                      <a name="boost.process.v2.environment.value_view.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>      
  <span class="keyword">typedef</span> <a class="link" href="../basic_cstring_ref.html" title="Struct template basic_cstring_ref">basic_cstring_ref</a><span class="special">&lt;</span> <span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">value_char_traits</span><span class="special">&lt;</span> <span class="identifier">char_type</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <a name="boost.process.v2.environment.value_view.string_view_type"></a><span class="identifier">string_view_type</span><span class="special">;</span>
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">value_char_traits</span><span class="special">&lt;</span> <span class="identifier">char_type</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <a name="boost.process.v2.environment.value_view.string_type"></a><span class="identifier">string_type</span><span class="special">;</span>     
  <span class="keyword">typedef</span> <span class="identifier">value_char_traits</span><span class="special">&lt;</span> <span class="identifier">char_type</span> <span class="special">&gt;</span>                                 <a name="boost.process.v2.environment.value_view.traits_type"></a><span class="identifier">traits_type</span><span class="special">;</span>     

  <span class="comment">// <a class="link" href="value_view.html#boost.process.v2.environment.value_viewconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="value_view.html#idm7892-bb"><span class="identifier">value_view</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="value_view.html#idm7893-bb"><span class="identifier">value_view</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  <a class="link" href="value_view.html#idm7897-bb"><span class="identifier">value_view</span></a><span class="special">(</span><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Source<span class="special">,</span> 
           <span class="keyword">typename</span>  <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special">&lt;</span><span class="identifier">is_constructible</span><span class="special">&lt;</span><a class="link" href="../basic_cstring_ref.html" title="Struct template basic_cstring_ref">string_view_type</a><span class="special">,</span> <span class="identifier">Source</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">value</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span><span class="special">&gt;</span> 
    <a class="link" href="value_view.html#idm7901-bb"><span class="identifier">value_view</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Source</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="value_view.html#idm7909-bb"><span class="identifier">value_view</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="value_view.html#idm7912-bb"><span class="identifier">value_view</span></a><span class="special">(</span><span class="identifier">char_type</span> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> <a class="link" href="value_view.html#idm7916-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> <a class="link" href="value_view.html#idm7922-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> <a class="link" href="value_view.html#idm7928-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="value_view.html#boost.process.v2.environment.value_view.string_view_type">string_view_type</a><span class="special">)</span><span class="special">;</span>
  <a class="link" href="value_view.html#idm7915-bb"><span class="special">~</span><span class="identifier">value_view</span></a><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="value_view.html#idm7834-bb">public member functions</a></span>
  <span class="keyword">void</span> <a class="link" href="value_view.html#idm7835-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <a class="link" href="value_view.html#boost.process.v2.environment.value_view.string_view_type">string_view_type</a> <a class="link" href="value_view.html#idm7840-bb"><span class="identifier">native</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <a class="link" href="value_view.html#idm7843-bb"><span class="keyword">operator</span> <span class="identifier">string_view_type</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <a class="link" href="value_view.html#idm7845-bb"><span class="keyword">operator</span> <span class="keyword">typename</span> <span class="identifier">string_view_type</span><span class="special">::</span><span class="identifier">string_view_type</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="value_view.html#idm7847-bb"><span class="identifier">compare</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="value_view.html#idm7852-bb"><span class="identifier">compare</span></a><span class="special">(</span><a class="link" href="value_view.html#boost.process.v2.environment.value_view.string_view_type">string_view_type</a><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="value_view.html#idm7857-bb"><span class="identifier">compare</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span><span class="special">,</span> 
           <span class="keyword">typename</span> Alloc <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span> 
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span> 
    <a class="link" href="value_view.html#idm7861-bb"><span class="identifier">basic_string</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Alloc</span> <span class="special">&amp;</span> <span class="special">=</span> <span class="identifier">Alloc</span><span class="special">(</span><span class="special">)</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <a class="link" href="value_view.html#idm7872-bb"><span class="identifier">string</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span> <a class="link" href="value_view.html#idm7874-bb"><span class="identifier">wstring</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">string_type</span> <a class="link" href="value_view.html#idm7876-bb"><span class="identifier">native_string</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="value_view.html#idm7878-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <a class="link" href="value_iterator.html" title="Struct value_iterator">value_iterator</a> <a class="link" href="value_view.html#idm7880-bb"><span class="identifier">begin</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <a class="link" href="value_iterator.html" title="Struct value_iterator">value_iterator</a> <a class="link" href="value_view.html#idm7883-bb"><span class="identifier">end</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span> <a class="link" href="value_view.html#idm7886-bb"><span class="identifier">c_str</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span> <a class="link" href="value_view.html#idm7888-bb"><span class="identifier">data</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="value_view.html#idm7890-bb"><span class="identifier">size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.29.12.8.5.10.4"></a><h2>Description</h2>
<div class="refsect2">
<a name="id-1.3.29.12.8.5.10.4.2"></a><h3>
<a name="boost.process.v2.environment.value_viewconstruct-copy-destruct"></a><code class="computeroutput">value_view</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><a name="idm7892-bb"></a><span class="identifier">value_view</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm7893-bb"></a><span class="identifier">value_view</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> p<span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm7897-bb"></a><span class="identifier">value_view</span><span class="special">(</span><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;&amp;</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Source<span class="special">,</span> 
         <span class="keyword">typename</span>  <span class="special">=</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special">&lt;</span><span class="identifier">is_constructible</span><span class="special">&lt;</span><a class="link" href="../basic_cstring_ref.html" title="Struct template basic_cstring_ref">string_view_type</a><span class="special">,</span> <span class="identifier">Source</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">value</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span><span class="special">&gt;</span> 
  <a name="idm7901-bb"></a><span class="identifier">value_view</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Source</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm7909-bb"></a><span class="identifier">value_view</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm7912-bb"></a><span class="identifier">value_view</span><span class="special">(</span><span class="identifier">char_type</span> <span class="special">*</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> <a name="idm7916-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> p<span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> <a name="idm7922-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;&amp;</span> p<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> <a name="idm7928-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="value_view.html#boost.process.v2.environment.value_view.string_view_type">string_view_type</a> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm7915-bb"></a><span class="special">~</span><span class="identifier">value_view</span><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.29.12.8.5.10.4.3"></a><h3>
<a name="idm7834-bb"></a><code class="computeroutput">value_view</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><span class="keyword">void</span> <a name="idm7835-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> other<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="value_view.html#boost.process.v2.environment.value_view.string_view_type">string_view_type</a> <a name="idm7840-bb"></a><span class="identifier">native</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm7843-bb"></a><span class="keyword">operator</span> <span class="identifier">string_view_type</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm7845-bb"></a><span class="keyword">operator</span> <span class="keyword">typename</span> <span class="identifier">string_view_type</span><span class="special">::</span><span class="identifier">string_view_type</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">int</span> <a name="idm7847-bb"></a><span class="identifier">compare</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="value_view.html" title="Struct value_view">value_view</a> <span class="special">&amp;</span> p<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">int</span> <a name="idm7852-bb"></a><span class="identifier">compare</span><span class="special">(</span><a class="link" href="value_view.html#boost.process.v2.environment.value_view.string_view_type">string_view_type</a> str<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">int</span> <a name="idm7857-bb"></a><span class="identifier">compare</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span> s<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span><span class="special">,</span> 
         <span class="keyword">typename</span> Alloc <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="identifier">CharT</span><span class="special">&gt;</span> <span class="special">&gt;</span> 
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span> 
  <a name="idm7861-bb"></a><span class="identifier">basic_string</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Alloc</span> <span class="special">&amp;</span> alloc <span class="special">=</span> <span class="identifier">Alloc</span><span class="special">(</span><span class="special">)</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <a name="idm7872-bb"></a><span class="identifier">string</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span> <a name="idm7874-bb"></a><span class="identifier">wstring</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">string_type</span> <a name="idm7876-bb"></a><span class="identifier">native_string</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="idm7878-bb"></a><span class="identifier">empty</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="value_iterator.html" title="Struct value_iterator">value_iterator</a> <a name="idm7880-bb"></a><span class="identifier">begin</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="value_iterator.html" title="Struct value_iterator">value_iterator</a> <a name="idm7883-bb"></a><span class="identifier">end</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span> <a name="idm7886-bb"></a><span class="identifier">c_str</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">*</span> <a name="idm7888-bb"></a><span class="identifier">data</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idm7890-bb"></a><span class="identifier">size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
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